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Town of Winifred

Sewage treatment plant, Winifred, Montana. NPDES permit MT0031453 expired Mar 31, 2024; its limits still apply. Last 12 months: over a limit 52 times (last May 2026), 2 required values missing, 1 of 14 reports late. Source: EPA ECHO, Oct 22, 2026.

Reports due
About 28 days after each period: form A monthly (29 values), form S twice a year
Last report on file
September 2026
Oct 2024 – Sep 2025
41 values over a limit, 0 required values missing, 0 of 14 reports late

Last 12 months (Oct 1, 2025 – Sep 30, 2026)

All 52 values over a limit
Period endingParameterReportedLimitOver by
October 2025BOD, 5-day, 20 deg. C, monthly average57 mg/L≤ 30 mg/L90%
October 2025BOD, 5-day, 20 deg. C, maximum weekly average57 mg/L≤ 45 mg/L27%
October 2025BOD, 5-day, percent removal, minimum28.75 %≥ 85 %375%
October 2025E. coli, MTEC-MF, monthly geometric mean37000 CFU/100mL≤ 126 CFU/100mL29265%
October 2025E. coli, MTEC-MF, weekly average37000 CFU/100mL≤ 252 CFU/100mL14583%
October 2025Solids, suspended percent removal, minimum-251 %≥ 85 %2240%
October 2025Solids, total suspended, monthly average11.33 lb/d≤ 5.3 lb/d114%
October 2025Solids, total suspended, monthly average316 mg/L≤ 30 mg/L953%
October 2025Solids, total suspended, maximum weekly average11.33 lb/d≤ 8 lb/d42%
October 2025Solids, total suspended, maximum weekly average316 mg/L≤ 45 mg/L602%
November 2025E. coli, MTEC-MF, monthly geometric mean55000 CFU/100mL≤ 630 CFU/100mL8630%
November 2025E. coli, MTEC-MF, weekly average55000 CFU/100mL≤ 1260 CFU/100mL4265%
November 2025Solids, suspended percent removal, minimum77.3 %≥ 85 %51%
November 2025Solids, total suspended, monthly average74 mg/L≤ 30 mg/L147%
November 2025Solids, total suspended, maximum weekly average74 mg/L≤ 45 mg/L64%
December 2025E. coli, MTEC-MF, monthly geometric mean330000 CFU/100mL≤ 630 CFU/100mL52281%
December 2025E. coli, MTEC-MF, weekly average330000 CFU/100mL≤ 1260 CFU/100mL26090%
December 2025Solids, suspended percent removal, minimum84.5 %≥ 85 %3%
December 2025Solids, total suspended, monthly average37 mg/L≤ 30 mg/L23%
January 2026BOD, 5-day, 20 deg. C, monthly average64 mg/L≤ 30 mg/L113%
January 2026BOD, 5-day, 20 deg. C, maximum weekly average64 mg/L≤ 45 mg/L42%
January 2026BOD, 5-day, percent removal, minimum54.3 %≥ 85 %205%
January 2026E. coli, MTEC-MF, monthly geometric mean760000 CFU/100mL≤ 630 CFU/100mL—
January 2026E. coli, MTEC-MF, weekly average760000 CFU/100mL≤ 1260 CFU/100mL60217%
January 2026Solids, suspended percent removal, minimum79.9 %≥ 85 %34%
February 2026BOD, 5-day, 20 deg. C, monthly average120 mg/L≤ 30 mg/L300%
February 2026BOD, 5-day, 20 deg. C, maximum weekly average120 mg/L≤ 45 mg/L167%
February 2026BOD, 5-day, percent removal, minimum-9 %≥ 85 %627%
February 2026E. coli, MTEC-MF, monthly geometric mean10000 CFU/100mL≤ 630 CFU/100mL1487%
February 2026E. coli, MTEC-MF, weekly average10000 CFU/100mL≤ 1260 CFU/100mL694%
March 2026BOD, 5-day, 20 deg. C, monthly average> 86 mg/L≤ 30 mg/L—
March 2026BOD, 5-day, 20 deg. C, maximum weekly average> 86 mg/L≤ 45 mg/L—
March 2026BOD, 5-day, percent removal, minimum-19 %≥ 85 %693%
March 2026E. coli, MTEC-MF, monthly geometric mean130000 CFU/100mL≤ 630 CFU/100mL20535%
March 2026E. coli, MTEC-MF, weekly average130000 CFU/100mL≤ 1260 CFU/100mL10217%
March 2026Solids, suspended percent removal, minimum59 %≥ 85 %173%
March 2026Solids, total suspended, monthly average39 mg/L≤ 30 mg/L30%
April 2026BOD, 5-day, 20 deg. C, monthly average65 mg/L≤ 30 mg/L117%
April 2026BOD, 5-day, 20 deg. C, maximum weekly average65 mg/L≤ 45 mg/L44%
April 2026BOD, 5-day, percent removal, minimum1.5 %≥ 85 %557%
April 2026E. coli, MTEC-MF, monthly geometric mean40000 CFU/100mL≤ 126 CFU/100mL31646%
April 2026E. coli, MTEC-MF, weekly average40000 CFU/100mL≤ 252 CFU/100mL15773%
April 2026Solids, suspended percent removal, minimum34.6 %≥ 85 %336%
April 2026Solids, total suspended, monthly average51 mg/L≤ 30 mg/L70%
April 2026Solids, total suspended, maximum weekly average51 mg/L≤ 45 mg/L13%
May 2026BOD, 5-day, 20 deg. C, monthly average41 mg/L≤ 30 mg/L37%
May 2026BOD, 5-day, percent removal, minimum68.5 %≥ 85 %110%
May 2026E. coli, MTEC-MF, monthly geometric mean3900 CFU/100mL≤ 126 CFU/100mL2995%
May 2026E. coli, MTEC-MF, weekly average3900 CFU/100mL≤ 252 CFU/100mL1448%
May 2026Solids, suspended percent removal, minimum14.3 %≥ 85 %471%
May 2026Solids, total suspended, monthly average114 mg/L≤ 30 mg/L280%
May 2026Solids, total suspended, maximum weekly average114 mg/L≤ 45 mg/L153%

Limits in force (35)

ParameterStatisticLimitMonths
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Temperature, water deg. centigrademonthly maximumreport only (deg C)all year
Temperature, water deg. centigrademonthly averagereport only (deg C)all year
Flow ratemonthly averagereport only (MGD)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Flow ratemonthly averagereport only (MGD)Jul–Sep
Flow ratedaily maximumreport only (MGD)Jan, Feb, Mar, Apr, May, Jun, Oct, Nov, Dec
Flow ratedaily maximumreport only (MGD)Jul–Sep
BOD, 5-day, 20 deg. Cmonthly average≤ 30 mg/Lall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 45 mg/Lall year
BOD, 5-day, 20 deg. Cmonthly average≤ 5.3 lb/dall year
BOD, 5-day, 20 deg. Cmaximum weekly average≤ 8 lb/dall year
BOD, 5-day, 20 deg. Cmonthly averagereport only (mg/L)all year
pHinstantaneous minimum≥ 6.5 SUall year
pHinstantaneous maximum≤ 9 SUall year
pHmonthly averagereport only (SU)all year
Solids, total suspendedmonthly average≤ 30 mg/Lall year
Solids, total suspendedmaximum weekly average≤ 45 mg/Lall year
Solids, total suspendedmonthly average≤ 5.3 lb/dall year
Solids, total suspendedmaximum weekly average≤ 8 lb/dall year
Solids, total suspendedmonthly averagereport only (mg/L)all year
Oil and grease, hexane extr methoddaily maximum≤ 10 mg/Lall year
Nitrogen, ammonia total [as N]monthly averagereport only (mg/L)all year
Nitrogen, ammonia total [as N]daily maximumreport only (mg/L)all year
Nitrite + Nitrate total [as N]monthly average≤ 10 mg/Lall year
Nitrite + Nitrate total [as N]daily maximum≤ 10 mg/Lall year
E. coli, MTEC-MFmonthly geometric mean≤ 126 CFU/100mLApr–Oct
E. coli, MTEC-MFmonthly geometric mean≤ 630 CFU/100mLJan, Feb, Mar, Nov, Dec
E. coli, MTEC-MFweekly average≤ 252 CFU/100mLApr–Oct
E. coli, MTEC-MFweekly average≤ 1260 CFU/100mLJan, Feb, Mar, Nov, Dec
Durationvaluereport only (d/mo)all year
Chlorine, total residualmonthly average≤ .1 mg/Lall year
Chlorine, total residualdaily maximum≤ .1 mg/Lall year
BOD, 5-day, percent removalminimum≥ 85 %all year
Solids, suspended percent removalminimum≥ 85 %all year
Oil and grease visualvaluereport only (Y=0;N=1)all year

How strict are these limits?

Cited limits by parameter: Montana's rules and the federal ones.

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Your permit document is the final word. As JSON: /api/v1/permits/MT0031453 · MCP: https://passage-data.com/mcp